Receive an order event

{
  "specversion": "1.0",
  "id": "evt_01k1a2b3c4d5e6f7g8h9j0k1m2",
  "source": "https://sandbox.api.bahnexpress.fi/v2",
  "type": "com.bahn.order.eta_changed.v1",
  "subject": "orders/ord_01k1a2b3c4d5e6f7g8h9j0k1m2",
  "time": "2026-08-03T08:40:00+03:00",
  "datacontenttype": "application/json",
  "data": {
    "order_id": "ord_01k1a2b3c4d5e6f7g8h9j0k1m2",
    "ordered_for": null,
    "order_sequence": 3,
    "resource_url": "/v2/orders/ord_01k1a2b3c4d5e6f7g8h9j0k1m2",
    "revision": "x5Bm9Qa2Kd7Rv1Nu4Le8Yc3Hj6Wp0Tg5FsZiAoUkEnM",
    "target": "delivery",
    "eta": "2026-08-03T15:20:00+03:00",
    "previous_eta": "2026-08-03T14:45:00+03:00",
    "window": {
      "start_at": "2026-08-03T14:00:00+03:00",
      "end_at": "2026-08-03T15:00:00+03:00",
      "timezone": "Europe/Helsinki"
    },
    "commitment_deadline_at": "2026-08-03T15:00:00+03:00",
    "reason": "outside_window"
  }
}